Draft controller



Feb. 11, 1936. s. M. GREEN 2,030,205

DRAFT CONTROLLER Filed June 6, 1935 2 Sheets-Sheet 1 B Wil IIH'IHIIIHII, 1H.

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\HIIHIW J 3 I fl? /3 l7 Z3 ATTORNEY.

2 Sheets-Sheet 2 llllll s. M. GREEN ll V DRAFT CONTROLLER Filed June 6,1935 Feb. 11, 1936.

Green ATTORNEY.

Patented Feb. 11,- v 1936 UNITED STATES PATENT OFFICE DRAFT CONTROLLERSay M. Green, Cleveland, Ohio Application June 6, 1935, Serial No.25,291 '1 Claims. (01. me -307) My present invention is an improvementin construction and efliciency in heat and draft controls over myprevious Patent No. 1,856,478, granted May 3, 1932.

One object of my present invention is to increase the efliciency of thedevice by decreasing the fuel waste and eliminating dangerous downdraft.

Another object of my invention is to construct a device at a moderatecost that is positive in action and ensures complete combustion of fuelsused and elimination of smoke and maximum economy in fuel consumption.

Still further objects and advantages are means for the inclusion of thecorrect amount of oxygen within the combustion chamber and a meanswhereby suificient draft is assured to completely eliminate waste gaseswithout loss in heating efficiency.

With these and other objects in view, my invention consists in theconstruction, arrangement and combination of the several parts of mydevice, whereby the objects contemplated are attained, as hereinafterm6re--fully set forth, in my specification and claims and illustrated inthe accompanying drawings, in which:

Fig. 1 is an elevation of the device used with gas fuel only.

Fig. 2 is a longitudinal section partly in elevation taken on lines 2-2of Fig. 1.

Fig. 3 is a top plan view partly in section, the outer body being cutaway on lines 33 of Fig. 2.

Fig. 4 is an elevation of the inner cone down draft diverter assembly.

Fig. 5 is an elevation of a second form of the device for use with coalor oil fuel.

Fig. 6 is a sectional view taken on lines 6-6 of Fig. 5.

Fig. 7 is a top plan view taken on lines of Fig. 6.

Fig. 8 is an enlarged fragmentary portion of the inner body structureshowing the louvres and louvre cover.

Fig. 9 is an enlarged fragmentary portion of the louvre cover shown inFig. 8.

Fig. 10 is a perspective view of inner louvre cover or slide.

Fig. 11 is an elevational view of a fragmentary portion of the louvrecover shown in Fig. 10, showing the tension spring.

Fig. 12 is an enlarged fragment showing the method of assembling theinner louvre cover in the tracks formed in the outer bell body.

Again referring to the drawings: a bell shaped outer structure III ofsuch shape as shown in Figs. 1 and 2 is open at the ends II and I2 forconnection to a stack and stove respectively, having a flat portion I3approximately half way between ends II and I2, and has mounted therein aband I 4 to which are attached a plurality of legs I5 by means of rivetsI6 as shown in Figs. 2, 3, and 4.

The upper ends I! of legs I5 are riveted to a small cone I8 near theedge of the larger circumference of the cone. The lower ends I9 of legsI5 are attached to the outer surface of .an

inner bell shaped structure 20 by means of screws 2I as shown in Figs. 2and 3.

Mounted within the inner bell shaped structure 20 is an inner pipe 22having a plurality of partly open ports 23 spaced alternately in rowsaround the upper portion of said inner pipe 22, each port 23 having thepartly cut-out portion bent inwardly in such manner as to form a shieldor deflector lip 24, as is shown in Figs. 20

2 and 3, said inner pipe 22 being peened at 2 over the top edge 26 ofthe inner bell shaped structure 20.

In operation the device is mounted in the stack of any gas heating unitwhere the gas is confined within a'closed structure and is attached to avent; any down draft coming down the stack (not shown) strikes thesurface of the "small cone l8 within the bell shaped outer structure It,is deflected by the said cone and flows out through the passage 21formed between the inner and outer bell shaped structures 20 and I0respectively.

Any draft escaping into the inner body 22 is caught by the inwardlyprojecting port shields 24 and diverted through the ports 23 into apassage 28 formed between the inner bell shaped structure 20 and thepipe 22.

ing 12, a slightly different form is shown for the use of fuels otherthan gas.

The outer body or shell structure 30 has a plurality of slottedapertures or louvres 3| around its circumference near the bottom portionas shown in Fig. 5. A track 32 is formed on the inner surface of thebody structure 30 as shown specifically in Fig. 12 and a louvre coverband valve 33 with slotted apertures 34, as shown in Figs. 6, 10, 11 and12 is mounted slidably within track 32 and is operated by a slottedflange 35 which is a part of said louvre cover band 33 and projectsoutwardly therefrom. A tension spring 36 of such shape as is shown inFigs. 6, 10 and 11, is attached by its lower ends to inwardly projectingflanges 31 and 38 of the louvre cover band 33.

The pressure of the tension spring 36 against the outer surface of theinner body structure 39 holds the louvre cover band 33 reasonably tightagainst the inner wall of the outer body structure 30 but not tightenough to prevent the said louvre cover band from being rotated easilyto open and close the louvre 3|.

The inner body structure 39 is attached at its bottom edge to the outerbody structure 30, the two edges being peened and beaded together toform a single unit.

A center pipe section 40 is attached in a similar manner at its upperend to the curved top edge 4| of the inner body structure 39.

Near the lower edge of the pipe 40 and at approximately the level of thelower edge of the inner body structure 39 is a series of slottedapertures forming louvres 42 and an outer louvre cover band 43 withslotted apertures 43a is superimposed over the center body 40 and isslidably retained by outwardly projecting beads 44 and 45 in the centerbody 40 at its upper and lower edges respectively.

The outer louvre cover band or valve 43 has a pair of lugs 46 and 41 atopposed sides of said louvre cover band, which are bent upward at anangle as shown in Figs. 6, 8 and 9 and having attached thereto handles48 as a means by which the louvre cover band may be rotated at will toopen or close the louvres 42 in the center body 40.

The same general principle is present in this form as in that of thedevice for gas fuel hereinabove described except that the use of thedown draft diverter cone is eliminated in this form and the louvres andlouvre covers in both the outer body structure 30 and the center body 40have been added.

It will be seen from the illustrations that when the louvres 3| and 42are covered by louvre cover bands 33 and 43 the device is entirelyclosed thus giving a through draft in the stack to start a fire. Whenthe fire is going well, both louvre covers are rotated, opening thelouvres 3| and 42; the air drawn in through the louvres 3| rises throughthe passage 49 formed between the outer body structure 30 and the innerbody structure 39 and forms an air baflie directly above the open top ofthe center body 40, and the change in the gaseous content is similar tothat described heretofore and pertaining to the first unit illustratedin Figs. 1 to 4.

The air baflie created by the shape of the outer and inner bodystructures is so low above the pipe 40 that it almost completelyprevents the escape of heat through the stack thus establishing agreater fuel economy.

And furthermore, actual tests have fully established the fact that thedevice as now constructed does in a large measure decrease the amount ofsmoke that enters the chinmey; the bell shaped cone throws oxygen overthe carbon and this action is responsible for the elimination of much ofthe smoke, especially where a poor grade of coal is used in the heatingunit.

I claim:

1. A draft controller comprising an inner pipe section having ports inthe sides thereof, an outer bell shaped shell spaced around said pipesection and adapted for connection to a stack at its upper end, and anintermediate bell shaped shell spaced between the pipe section and thefirst-mentioned bell shaped shell and forming an air passage betweensaid shells, said passage being open at its lower end, the saidintermediate section depending from the upper end of the pipe sectionand the outer bell shaped shell being supported upon the intermediateshell.

2. A draft controller as in claim 1, and a defleeting cone supportedwithin the outer shell and above the upper end of the pipe section.

3. A draft controller as in claim 1, the pipe section having said portsinto the space between said section and the intermediate shell.

' 4. A draft controller as in claim 1, the pipe sections having saidports opening into the intermediate shell and deflecting lips besidesaid ports.

5. A draft controller comprising a pipe section, an intermediate shelldepending around said pipe section and spaced therefrom and secured atits upper end to the top thereof, and an outer shell spaced around thesaid intermediate shell to form an air passage and secured at its lowerend to the lower end of said intermediate shell, said passage being openat its lower end, the outer shell being formed for connection at itsupper end to a stack.

6. A draft controller as in claim 5, the outer shell having a row ofports near its lower end, and a valve band controlling said ports.

7. A draft controller as in claim 5, the pipe section having a row ofports around the same, and a valve band controlling said ports.

SAY M. GREEN.

